An army of zombies has invaded America, according to Newsweek.
"The undead have risen from their graves and invaded large portions of the East Coast," the venerable American news publication has reported on its website, Newsweek.com. "Driven only by an insatiable desire for brains, there seems to be no stopping their ruthless …

Available as jQuery plugin

So, either...

...the devs told a friend who told a friend, or some dude out there was looking at newsweek and randomly said to himself, "Hmm - I wonder what happens if I put in the Konami code? Something awesome, I'll bet!"